Fax Protocols

What is the difference between fax relay and pass-through ?


Router(config-dial-peer)#fax protocol ?
cisco Use Cisco proprietary protocol
none No FAX protocol
pass-through Use an audio codec for fax transport
system Use choice specified in global fax protocol CLI
t38 Use T.38 protocol

Relay        :  Cisco  and T38
pass-through :  Use an audio codec for fax transport
None : disable both mode

with path-through you will use more bandwidth than fax relay because it will use G711

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